5. Set the HORIZ DISPLAY switch to B DLY'D.
6. Slightly readjust the DTP control to move the first time
measurement point to some vertical reference line (see
Fig. 2-13, B). Note the DTP control setting.
7. Adjust the DTP control to move the second time mea
surement point to the same vertical reference line (see
Fig. 2-13, B). Note the DTP control setting.
NOTE
If several signal repetitions exist between the
time measurement points, switch to the A
Intensified mode to locate the correct repeti
tion, then back to the B Delayed mode to
make the measurement. D,o not move the
horizontal POSITION control.
Operating Instructions—455/A2/B2
2. With the DELAY TIME POS control, move the left
edge of the intensified zone to the left side of the portion
of the A sweep display to be magnified.
3. Set the B TIM E/DIV switch so just the portion of the
A sweep display to be magnified is intensified (see Fig.
2-14, A).
4. Set the HORIZ DISPLAY switch to B DLY'D. The por
tion of the A sweep display that was intensified in step 3
is not displayed in magnified form (see Fig. 2-14, B). The
displayed sweep rate is determined by the B TIM E/DIV
switch. To calculate the apparent magnification factor,
use the formula:
Apparent _ A .TIME/DIV switch setting
.*â– Magnification B TIM E/DIV switch setting
8. Use the following formula to find the time difference.
second
first A TIM E/DIV
Time DTP - DTP
x switch
Difference setting setting setting
Example:
The A TIME/DIV switch was set to 0.2 ms/division and
the B TIM E/DIV to 10 /ts/division. The first DTP control
setting was 0.88 (at point A, Fig. 2-13, A) and the second
was 5.57 (at point B, Fig. 2-13, A).
Substituting the given values:
Time
Difference
(5.57 - 0.88) x 0.2 ms
Time Difference = 0.938 ms
Delayed-Sweep Magnification
The B Delayed mode can provide higher apparent sweep
rate magnification than that provided by the X I0 MAG
switch. First try the Magnified-Sweep-Starts-After-Delay
method. If this produces too much horizontal jitter, try
the Magnified-Sweep-Triggered-After-Delay method.
MAGNIFIED SWEEP STARTS AFTER DELAY.
1. Set the HORIZ DISPLAY switch to A INTEN and
the B SOURCE switch to STARTS AFTER DELAY.
Fig. 2-14. Delayed Sweep magnification.
REV. A, OCT 1975
2-13
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